261066104 has 64 divisors (see below), whose sum is σ = 540419040. Its totient is φ = 117504000.

The previous prime is 261066089. The next prime is 261066109. The reversal of 261066104 is 401660162.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261066109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1039979 + ... + 1040229.

Almost surely, 2^261066104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261066104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270209520).

261066104 is an abundant number, since it is smaller than the sum of its proper divisors (279352936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261066104 is a wasteful number, since it uses less digits than its factorization.

261066104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480 (or 476 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 261066104 is about 16157.5401593188. The cubic root of 261066104 is about 639.1216009397.

The spelling of 261066104 in words is "two hundred sixty-one million, sixty-six thousand, one hundred four".